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contrib/lo's lo_manage() thought it could use trigdata->tg_trigger->tgname in its error message about not being called as a trigger. That naturally led to a core dump. unique_key_recheck() figured it could Assert that fcinfo->context is a TriggerData node in advance of having checked that it's being called as a trigger. That's harmless in production builds, and perhaps not that easy to reach in any case, but it's logically wrong. The first of these per bug #16340 from William Crowell; the second from manual inspection of other CALLED_AS_TRIGGER call sites. Back-patch the lo.c change to all supported branches, the other to v10 where the thinko crept in. Discussion: https://postgr.es/m/16340-591c7449dc7c8c47@postgresql.org
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree. This does not preclude their
usefulness.
User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
built automatically, unless you build the "world" target. You can
also build and install them all by running "make all" and "make
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.
Some directories supply new user-defined functions, operators, or
types. To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command. In a fresh database,
you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
procedure.